Dissolving a substance is considered a physical change.
When a substance dissolves in a solvent, the particles of the substance are dispersed throughout the solvent and become evenly distributed, but the chemical composition of the substance does not change. The dissolved substance retains its chemical properties and can be separated from the solvent by physical means such as evaporation or distillation.
A chemical change, on the other hand, involves a change in the chemical composition or properties of a substance. It typically involves the formation of new substances, the breaking or making of chemical bonds, and the release or absorption of energy. Examples of chemical changes include combustion, rusting, and acid-base neutralization.
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23. Boron combined with oxygen during glass making, creates glass that is *
O bluish in color
O shatter proof
O flexible
O heat resistant
Answer: heat resistant
Boron oxide is added to glass during the manufacturing process, it causes the glass to have a blue tint, increases its strength, and makes it more resistant to breaking and shattering, also increases the heat resistance of glass and makes it more flexible, allowing it to be bent without breaking.
What gas is not used during fermentation ?
Fermentation does not require oxygen as it is an anaerobic process. If oxygen is present, pyruvate will be completely oxidized to water and carbon dioxide molecules by some yeast species spiration. On the other hand, yeast species will produce ethanol only in an anaerobic environment by a process called Pasteur Effect.
What is fermentationFermentation is a process of energy production in cells with a state anaerobic (without oxygen) that produces changes in organic biochemistry through the action of enzymes. Fermentation is a form of anaerobic respiration in general, but there is a more precise definition that defines fermentation as respiration in an anaerobic environment without the presence of an external electron acceptor. Examples of fermentation can be found in bread making, wine (beer) and cheese making.
Sugar is a common ingredient in fermentation. Some examples of fermented products are ethanol, lactic acid and hydrogen. However, several other components can also be produced from fermentation, such as butyric acid and acetone. Yeast is a common fermenting agent used to produce ethanol in beer, wine, and other alcoholic beverages. Anaerobic respiration (without external electron acceptor) in mammalian muscles during hard work can be classified as a form of fermentation which produces lactic acid as a by-product. This accumulation of lactic acid can cause muscle fatigue.
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when was the last time a third-party candidate won any electoral votes?
The last third-party candidate to win one or more states was George Wallace of the American Independent Party in 1968.
Who was George Wallace?
Born in Clio, Wallace attended the University of Alabama School of Law and served in the United States Army Air Corps during World War II. After the war, he won election to the Alabama House of Representatives and served as a state judge.He first sought the Democratic nomination in the 1958 Alabama gubernatorial election. Initially a moderate on racial issues, Wallace adopted a hardline segregationist stance after losing the 1958 nomination.To know more about George Wallace, click the link given below:
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Compared with solid ionic compounds, solid molecular compounds generally...
A) have lower melting points
B) are more brittle
C) are harder
D) conduct electricity as liquids
A) have lower melting points. Compared with solid ionic compounds, solid molecular compounds generally have lower melting points.
Ionic compounds are held together by the electrostatic attraction between positively and negatively charged ions, while molecular compounds are held together by weaker van der Waals forces between neutral molecules. The strong electrostatic forces in ionic compounds give them high melting and boiling points, while the weaker intermolecular forces in molecular compounds result in lower melting and boiling points. Due to this reason, solid molecular compounds generally have lower melting points than solid ionic compounds. The strong ionic bonds in ionic compounds require more energy to overcome in order to melt or boil the compound, while the weaker intermolecular forces in molecular compounds are easier to overcome.
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14. Contrast how Beryllium and Fluorine will each follow the "octet rule." Be sure to explain how their charges are
affected by this change:
Since beryllium only possesses two valence electrons, exchanging electrons is often not how an octet rule is formed. Two solitary covalent bonds between the elements beryllium and hydride (BeH2) make up the Lewis structure of the gaseous compound.
What causes BeCl2 to break the octet rule?Dots are used to represent the three pairs of unpaired electrons on chlorine. It only has three pairs of electrons in the valence shell of boron. Because some atoms do not have full octets, molecules like BeCl2 and BCl3 are referred to as electron deficient.
Does beryllium have a lower octet count?It is known that beryllium can form compounds in which it is encircled by less than eight electrons. This is an acceptable solution because B Sulfur can hold more than an octet.
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Is NH3 and H2O polar or nonpolar?.
[tex]NH_{3}[/tex] (ammonia) and [tex]H_{2}O[/tex] (water) are both polar molecules and not nonpolar.
This is due to the difference in electronegativity between the atoms in each molecule.
Ammonia has a nitrogen atom, which has a higher electronegativity than the hydrogen atoms, resulting in a partial negative charge on the nitrogen atom and a partial positive charge on the hydrogen atoms.
Water, on the other hand, has two hydrogen atoms and one oxygen atom, with the oxygen atom having a higher electronegativity than the hydrogen atoms.
This results in a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. The partial charges on the atoms in each molecule create an asymmetrical distribution of charge, making the molecules polar.
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The mass number is always found by:
protons + electrons
protons + neutrons
neutrons + electrons
protons + neutrons + electrons
Answer: The answer is protons + neutrons!
Explanation: mass number = protons + neutrons.
Have a great day!
What is the osmotic pressure of a 1.4 M aqueous solution of glycerin in water at 47 °C? Report your answer in atm and round to the second decimal place. Glycerin = C3H5(OH)3
Mole fraction of methanol is equal to moles of methanol divided by moles of glycerine. = 4.05 mol / (4.05 mol + 0.2555 mol). = 0.941.
We must first determine how many moles of methanol are present in the solution. The molar mass of methanol (32.04 g/mol) is used for this. 130 g / 32.04 g/mol equals 4.05 moles. Calculating the amount of glycerine in the solution is also necessary. The molar mass of glycerine (92.09 g/mol) is used for this. 23.5g/92.09g/mol is 0.2555 moles. The number of moles of a component divided by the total number of moles in the solution yields the mole fraction of that component. Mole fraction of methanol is equal to moles of methanol divided by moles of glycerine. = 4.05 mol / (4.05 mol + 0.2555 mol). = 0.941.
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which unit is closest in size to the radius of an atom
An atom's radius is well under 1 nanometer, or one billionth of a meter.
What is an atom?An atom is a matter particle that defines a chemical element uniquely. An atom is made up of a central nucleus and one or more negatively charged electrons. The nucleus is positively charged and contains one or more protons and neutrons, which are relatively heavy particles.An element is made up of only one type of atom. Atoms are further subdivided into subatomic particles known as electrons, protons, and neutrons. Chemical reactions allow elements to combine to form molecules.The distance between the nuclei of two identical atoms bonded together is used to calculate atomic radius. Atoms' atomic radius decreases from left to right across a period. Atoms' atomic radius generally increases from top to bottom within the atom.To learn more about atom refer to :
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Sig figs please help
Answer: The answer is A) 190
Explanation:
1.902 - 1.43 = 0.472
87.4 ÷ (0.472)
87.4 ÷ 0.472
87.4 ÷ 0.472 = 185.1694915254238
185.1694915254238
Round 185.1694915254238 to 190 (Sig Figs: 2)
I hope this helps!
For the compound fecl3, we can, with the aid only of a periodic table, determine its
a. molarity and molar mass
b. mass percentage
c. molar mass and molecular formula
d. mass percentage, molar mass, and empirical formula
From the periodic table, we can find the molar mass and the molecular formula. Option C.
What can we see from the periodic table?We can see that we can be able to locate several elements in the periodic table. In the periodic table of the elements, the elements can be classified in groups and periods.
The groups tell us the number of the valence electrons that we can be able to find in the atom that we are looking at. Now we know that the valency of iron and chlorine can be read off from the periodic table as well as the masses of the elements and this can help us to find the molar mass and the molecular formula.
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Is PCl5 polar or nonpolar molecule?.
PCl5 is a polar molecule. In order to determine whether a molecule is polar or nonpolar, we need to consider the arrangement of atoms within the molecule and the electron-pair geometry.
PCl5 is a symmetric molecule; it has a trigonal bipyramidal shape, which is characterized by the presence of five chlorine atoms around the central phosphorus atom. However, the electron-pair geometry around the phosphorus atom is only tetrahedral. This is because one of the pairs of electrons on the phosphorus atom is involved in forming a bond with a chlorine atom.
The symmetry of the molecule and the difference in electronegativity between the phosphorus and chlorine atoms result in a polar molecule. The chlorine atoms pull the electrons in the covalent bonds towards themselves, creating a partial negative charge on the chlorine atoms and a partial positive charge on the phosphorus atom. The net dipole moment of PCl5 is not zero, which confirms the polarity of the molecule.
In summary, PCl5 is a polar molecule due to the difference in electronegativity between the phosphorus and chlorine atoms and the asymmetry of the molecule. The electrons are pulled towards the chlorine atoms, creating a partial positive charge on the phosphorus atom and a partial negative charge on the chlorine atoms.
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when chlorine is bubbled through sodium hydroxide solution, it makes bleach, NaOCl.
how much chlorine is needed to covert 100g of sodium hydroxide solution into bleach?
2Na+Cl2 --> NaOCl+NaCl+H2O
relative atomic masses (Ar): Na=23 O=16 H=1 Cl=35.5
What is the mass of chlorine?
(Best answer = brainliest!!!)
The mass of chlorine that is needed to convert 100g of sodium hydroxide solution into bleach is 88.75 g.
What mass of chlorine is needed to convert 100g of sodium hydroxide solution into bleach?The mass of chlorine that is needed to convert 100g of sodium hydroxide solution into bleach is determined from the equation of the reaction g9ven below:
2 NaOH + Cl₂ ---> NaCl + NaClO + H₂O
Based on the chemical equation, we need 2 moles of Sodium Hydroxide for every mole of Chlorine.
Molar mass of NaOH = 40 g/mol
Molar mass of Cl₂ = 71.0 g/mol
Mass of chlorine required = 100/40 * 1/2 * 71
Mass of chlorine required = 88.75 g of chlorine
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A substance made up of only silicon and chlorine contains 79. 1% mass % of chlorine. If the molar mass is 537. 8 g/mol, what is the molecular formula.
We first need to know the atomic weights of silicon and chlorine in order to obtain the empirical formula.Answer:Statistical SiCl3 ,Atomic Si2Cl6
What is the molecular formula ?It has a chlorine content of 79.1%, therefore (100 - 79.1)% silicon equals 20.9% chlorine.
We first need to know the atomic weights of silicon and chlorine in order to obtain the empirical formula.
it is 35.5 and 28.
The percentage abundances are then divided by the corresponding atomic masses
explain,
Cl = 79.1/35.5 = 2.23
Si = 20.9/28 = 0.75
The result of this division by the smallest number is 0.75.
Cl = 2.23/0.75 = 3
Si = 0.75/0.75 = 1
SiCl3 is the empirical formula.
The molecular formula is as follows:
(28+3(35.5))n = 269
134.5n = 269
n = 269/134.5 = 2
Si2Cl6 is the molecular formula.
Answer:Statistical SiCl3 ,Atomic Si2Cl6
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How many total molecules are in o2?.
There are two molecules of oxygen (O2) in one molecule of O2.
Oxygen (O2) is a molecule made up of two atoms of oxygen. These atoms are bonded together using a covalent bond, which means they share electrons. The molecular formula of O2 is O2, which means that there are two atoms of oxygen in one molecule of O2.
Because of this, there are a total of 2 oxygen atoms and 2 molecules of O2. Oxygen is a colorless, odorless, and tasteless gas that is essential for life and is found in the Earth's atmosphere. It is also used in many industrial processes, such as combustion and respiration, and is a key component of the Earth's carbon cycle.
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which size of micropipette would you select to deliver 215 microliters?
The size of micropipette that you would select to deliver 215 microliters would be a micropipette with a volume range of 200-1000 microliters.
What is a micropipette?
A micropipette is a laboratory instrument used to measure and dispense small volumes of liquid, typically in the range of microliters (µL) or nanoliters (nL). They are commonly used in chemistry, biology, and biochemistry experiments, as well as in clinical and industrial settings.
Micropipettes consist of a handle, a digital or manual volume adjustment mechanism, and a tip that is placed into the liquid to be dispensed. They work by creating a vacuum or positive pressure inside the tip, which draws or pushes the liquid out of the tip.
Micropipettes come in different volume ranges and it is important to select the right one to ensure accurate delivery of the desired volume. For example, a micropipette with a volume range of 2-10 microliters would not be suitable for delivering 215 microliters, while a micropipette with a volume range of 200-1000 microliters would be more appropriate.
It's also important to note that, even if the micropipette is able to deliver 215 microliters, you should always check the calibration of the micropipette before use, to make sure that it's delivering the correct volume.
Hence, a micropipette with a volume range of 200-1000 microliters is suitable to deliver 215 microliters.
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What is meant by 2 h2o?.
Answer:
2 atoms of Hydrogen and 1 atom of Oxygen comprises to form the water molecule. To show the two atoms of Hydrogen we use subscript 2.
Explanation:
(◕ᴗ◕✿)(◕ᴗ◕✿)(◕ᴗ◕✿)
Consider the reaction
2A + B C
-
(a) In the diagram here that represents the re-
action, which reactant, A or B, is the limiting reagent?
(b) Assuming complete reaction, draw a molecular-model representation of the amounts of reactants and products left after the reaction. The
atomic arrangement in C is ABA.
A is the limiting Reagent and C has 4 moles.
What is limiting reagent?
Limiting reagents are the reactants in a reaction that completely react and limit the amount of product that can be formed. When two reactants are present in a reaction, the limiting reagent will be the one that runs out first, thus limiting the amount of product that can be created.
(a) As per the given diagram,
The number of B atoms are = 5
the number of A atoms are = 8.
Given reaction,
2A+B → C
the Balanced equation show that,
2A + B → C
2 mol. 1 mol. 1 mol
two mols of "A reacts with 1 mole of B. So
for 5 atoms of B. We required 10 atoms of A. But given atoms of A are 8.
So → A is the limiting Reagent.
(b) After a complete reaction, the number of moles of C = 2A+B → C
As we check 'A' is our limiting Reagent.
So, 2A. + B. → C
2 mol. 1 mol. 1 mol
As 2 mol of A give 1 mol of C
So, 8 mol of A will give 4 mol of C
we can also say that 1mol of B gives 1 mol of C. So 4 moles of A give 4 moles of C.
A is the limiting reagent, so 8 moles of A will give 4 moles of C.
therefore, C moles = 4.
Hence, A is the limiting Reagent and C has 4 moles.
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When 16.5 g of calcium carbonate react with an excess of hydrochloric acid, calcium chloride, carbon dioxide, and water vapor are produced. Write the equation. What is the theoretical yield of carbon dioxide
One mole of calcium carbonate reacts with 2 moles of HCl forms one mole of calcium chloride, water and carbon dioxide each. The theoretical yield of calcium chloride from 16.5 g of calcium carbonate is 18.3 g.
What is theoretical yield ?Theoretical yield of a reaction is the amount of product that is calculated theoretically calculated based on the balanced chemical equation.
The balanced equation of the reaction between calcium carbonate and HCl is given as follows:
[tex]\rm CaCO_{3} + 2HCl \rightarrow CaCl_{2} + CO_{2} + H_{2}O[/tex]
Molar mass of calcium carbonate = 100 g/mol
molar mass of calcium chloride = 111 g/mol
Hence, 100 g of calcium carbonate produce 111 g of calcium chloride. Then, mass of calcium chloride from 16.5 g is:
(111× 16.5) /100 = 18.3 g.
Therefore, the theoretical yield of the reaction is 18.3 g of calcium chloride.
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Please help!!! [picture provided]
Answer: All of the nonmetals are found to the right side of the zigzag line!
Explanation:
The little yellow highlighted zig-zag line separates the metals from the non-metals, the nonmetals can be found to the right of the line!!
What is the mass of moles of H2O?.
The mass of moles of H₂O (water) = 18.02 grams.
The method the mass of any molecule, formula unit, or ion is equal to the sum of the average atomic masses of all the atoms in its formula.
H's average atomic mass is 1.01 amu.
O's average atomic mass is 16.00 amu.
Hence,
2 H atoms = 1.01 amu / 1 H atom = 2.02 amu
1 O atoms = 16.00 amu / 1 O atom = 16 amu
2.02 amu + 16 amu = 18.02 amu
So, the mass of moles of H₂O (water) = 18.02 amu = 18.02 grams.
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the stem of a meat thermometer shall be constructed of
They feature glass or metal stems and are liquid-filled thermometers. The colored liquid inside the stem expands and rises as the food's internal temperature rises, providing a scale-based indication of the temperature. False high readings can occur as a result of heat conduction in the metal stems.
What's the ideal amount of time to insert a bimetallic stemmed thermometer?For them to accurately record the temperature, it can take up to two minutes. The bimetal stem thermometer can precisely gauge the temperature of meals that are quite deep or thick, including beef roasts and items cooked in stockpots.They feature glass or metal stems and are liquid-filled thermometers. The colored liquid inside the stem expands and rises as the food's internal temperature rises, providing a scale-based indication of the temperature. False high readings can occur as a result of heat conduction in the metal stems.The colored liquid inside the stem expands and rises as the food's internal temperature rises, providing a scale-based indication of the temperature. False high readings can occur as a result of heat conduction in the metal stems.To learn more about thermometers refer to:
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List the following aqueous solutions in order of decreasing freezing point: 0. 040 m glycerin ( c3h8o3 ), 0. 020 m kbr , 0. 030 m phenol ( c6h5oh ).
Glycerine = Potassium Bromide > Phenol is the aqueous solutions in order of decreasing freezing point.
Define freezing point
The freezing temperature of a liquid is the temperature at which it solidifies. The freezing point typically rises with increasing pressure, just like the melting point does. Combinations and some organic materials, like lipids, have freezing points that are lower than melting points.
Glycerine freezing results in a depression of 0.0744 degrees Celsius.
The freezing depression when using KBr is 0.0744 degrees Celsius.
The freezing point is lowered by phenol by 0.0558°C.
The amount by which the freezing point of the solvent will change when 1.00 moles of a non-volatile, nonionizing (no dissociating) solute dissolve in 1 kilogram of solvent is denoted by the term Kf, also known as the molal freezing point depression constant.
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help mi plss help me help mi pl
A material's mass expressed in grams per mole of the chemical is known as its molar mass.
What is meant by molar mass?The molar mass of a chemical compound is defined in chemistry as the relationship between a sample's mass and its substance content. The molar mass of a substance is a bulk property rather than a molecular property.
The molar mass of a material is its mass expressed in grams per mole of the chemical. The number of atoms, molecules, or ions in a substance is measured in terms of moles.
The molar mass of a chemical can be used to calculate its mass per mole. In other words, it provides the amount of grams in a substance per mole. As a result, molar mass is measured in grams/mole.
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What is energy consumption in cloud?.
Energy consumption in the cloud refers to the amount of energy used by data centers and other infrastructure that provide cloud computing services.
This includes the energy used to power servers, cooling systems, and networking equipment, as well as the energy used to transport data over networks.
As cloud computing has become increasingly popular, energy consumption has become a significant concern for both cloud providers and users, as the energy required to run data centers can be substantial. To mitigate this, cloud providers are investing in more energy-efficient technologies and practices, such as using renewable energy sources and implementing more efficient cooling systems.
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Which compound will precipitate when solutions of iron(ii) acetate, fe(c2h3o2)2, and potassium iodide (ki) are mixed?.
Iron(II) iodide will precipitate when solutions of iron(ii) acetate, fe(c2h3o2)2, and potassium iodide (ki) are mixed.
Define precipitate.
Precipitate is a solid that is created when a solution changes, frequently as a result of a chemical reaction or a shift in temperature that makes a solid less soluble. A precipitate in meteorology is either liquid or solid water.
Fe(C 2H 3O 2) 2 + KI → K(C 2H 3O 2 ) 2 + FeI 2
An insoluble substance that separates from a liquid solution is referred to as a precipitate. Precipitation is the process through which an insoluble solid emerges from a solution.
The inorganic substance iron(II) iodide has the formula FeI2. In organic processes, it serves as a catalyst. Iron (II) iodide is thought to be insoluble in aqueous solutions. We can categorize it as a precipitation reaction because of this.
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Glucose and fructose are simple carbohydrates with the molecular formula c6h12o6. Sucrose , or table sugar, is a complex carbohydrate with molecular formula c12h22o11 that consists of a glucose unit covalently linked to a fructose unit (a water molecule is released as a result of the reaction between glucose and fructose to form sucrose). Estimate the standard enthalpy of combustion of sucrose (in kj/mol) from the standard enthalpies of formation of the reactants and products.
The standard enthalpy of combustion is ΔHcombustion = ΔHf(products) - ΔHf(reactants) = -6353.8 kJ/mol - (-2218.2 kJ/mol) = -4135.6 kJ/mol.
How to estimate the standard enthalpy of combution of sucrose?To estimate the standard enthalpy of combustion of sucrose, we can use the standard enthalpies of formation of the reactants and products. Here are the steps to follow:Write out the balanced equation for the combustion of sucrose: C12H22O11 + 12O2 --> 12CO2 + 11H2OLook up the standard enthalpies of formation for each of the reactants and products. These can be found in tables of thermodynamic data.Use the equation ΔH combustion = ΔHf(products) - ΔHf(reactants) to calculate the standard enthalpy of combustion.The standard enthalpies of formation of reactants are C12H22O11 (sucrose) + 12O2(g) = -2218.2 kJ/mol + 0 kJ/mol = -2218.2 kJ/molThe standard enthalpies of formation of products are 12CO2(g) + 11H2O(l) = -3935.4 kJ/mol + -2418.4 kJ/mol = -6353.8 kJ/molTherefore the standard enthalpy of combustion is ΔHcombustion = ΔHf(products) - ΔHf(reactants) = -6353.8 kJ/mol - (-2218.2 kJ/mol) = -4135.6 kJ/mol.To learn more about standard enthalpy refer:
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draw the structure of the organic product or products formed in the reaction.H2C=CH-CH=CH-CH2-Mg-Br
In the given reaction, H2C=CH-CH=CH-CH2-Mg-Br is Grignard's reagent which reacts with D2O to give H2C=CH-CH=CH-CH2-D and MgBrOH.
When H2C=CH-CH=CH-CH2-Mg-Br reacts with D2O the C-Mg bond donates its electron pair to a deuterium atom, forming H2C=CH-CH=CH-CH2-D and MgBrOH.
This occurs because the Carbon that is bonded with Mg is strongly nucleophilic and can attack a region of positive charge density such as a deuterium atom in a water molecule.
Grignard's reagents are highly reactive organomagnesium halides formed by the reaction of magnesium metal with alkyl or alkenyl halides.
It has a general formula of R-Mg-X where R is an organic group and X is a halogen which can be anything Chlorine (Cl), Bromine (Br), or Iodine (I).
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a bond that exists between two full, opposite charges
After two or more atoms lose or receive electrons to create an ion, an ionic bond can occur. Ionic bonds form when metals lose electrons and nonmetals acquire electrons.
Ions with opposing charges attract one other, forming an ionic connection.The full movement of electrons from one atom to another forms an ionic connection. When an atom loses one or more electrons, it transforms into a cation—a positively charged ion. An anion—a negatively charged ion—is formed when an atom gains one or more electrons. Ionic bond is the principal interaction in ionic compounds and includes the electrostatic attraction between oppositely charged ions or between two atoms with drastically differing electronegativities. Along with covalent bonding and metallic bonding, it is one of the three major forms of bonding. Ions are electrostatically charged atoms (or groups of atoms). When atoms gain electrons, they produce negatively charged ions (called anions). Atoms that lose their electrons produce positively charged ions (called cations).
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B. Solution Reactions Solution Tested Solution Reaction Observation Ammonium Carbonate Unknown solution (D. 31)_______ ___________________________ Compare the flame test and solution reactions for the unknown to the observations in Procedure A. 1 and A. 2. Identify the alkali or alkaline earth element in the unknown solution; circle or underline one of the following: barium calcium lithium potassium sodium strontium
When testing the unknown solution (D. 31) with ammonium carbonate, the solution will react with the ammonium carbonate to form a white precipitate.
This indicates that the unknown solution contains an alkali or alkaline earth metal, such as sodium, potassium, calcium, strontium, or barium.
To identify the element present in the unknown solution, you can use a flame test or a solution reaction test. For the flame test, a small portion of the unknown solution is placed in a flame and the emitted light will be characteristic of the element present.
For the solution reaction test, a small portion of the unknown solution is mixed with a known solution of an alkali or alkaline earth metal and the reaction is observed. If a precipitate is formed, it indicates that the element present in the unknown solution is the same as the element present in the known solution. By comparing the observations from these tests with the observations in Procedure A. 1 and A. 2, you can identify the element present in the unknown solution.
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